Oki B6500

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Chapter 1 Troubleshooting
FIP1.26 ROS ASSY
Step Check Yes No
Possible causes:
ROS ASSY (PL8.1.1)
HARNESS ASSY ROS (PL8.1.2)
INTERLOCK S/W 5V (PL8.1.12)
HARNESS ASSY LVPS (PL12.1.1)
HVPS/MCU (PL12.1.19)
LVPS (PL12.1.5)
1
Checking the power to Laser Diode of ROS ASSY
Remove COVER TOP ASSY (PL1.1.7). (RRP1.4)
Disconnect P/J140 from ROS ASSY.
Install EP CARTRIDGE.
Close COVER OPEN (PL1.1.2).
Is the voltage across J140-8(+) and J140-7(-), 5 VDC?
Go to step 8. Go to step 2.
2
Checking INTERLOCK S/W 5V
Remove INTERLOCK S/W 5V.
Is it continuous between P/J142-1 and P/J142-3, when
INTERLOCK S/W 5V is pushed, and is not when
released?
Go to step 3.
Replace INTER-
LOCK S/W 5V.
(RRP8.5)
3
Checking SWITCH I/L ASSY 5V
Remove SWITCH I/L ASSY 5V.
Is it continuous between P/J144-1 and P/J144-3, when
SWITCH I/L ASSY 5 V is pushed, and is not when
released?
Go to step 4.
Replace SWITCH I/
L ASSY 5V.
(RRP1.6)
4
Checking HARNESS ASSY LVPS
Disconnect P/J141 of HARNESS ASSY LVPS.
Is it conductive between P/J141-1 and P/J141-3 when
INTERLOCK S/W 5V and SWITCH I/L ASSY 5V are
pushed simultaneously, and is not when released?
Go to step 5.
Replace HAR-
NESS ASSY LVPS.
5
Checking HARNESS ASSY ROS
Disconnect P/J14 from HVPS/MCU.
Disconnect P/J140 from ROS ASSY.
Is it continuous between P/J14-1 and P/J140-8, when
INTERLOCK S/W 5V and SWITCH I/L ASSY 5V are
pushed simultaneously, and is not when released?
Go to step 6.
Replace HAR-
NESS ASSY ROS.
6
Checking power to HVPS/MCU
Remove SHIELD PLATE LVPS. (RRP12.1)
Install EP CARTRIDGE.
Disconnect P/J41 from LVPS.
Is the voltage across P/J41-4 and P/J41-3, 5 VDC?
Replace LVPS.
(RRP12.3).
Go to step 7.
7
Checking HVPS/MCU for continuity
Disconnect P/J14 and P/J11 from HVPS/MCU.
Is there continuity between P/J14-1 and P/J11-13?
Go to step 8.
Replace HVPS/
MCU. (RRP12.10).
8
Checking HARNESS ASSY LVPS for continuity
Disconnect P/J11 from HVPS/MCU.
Is there continuity between P/J11-13 and P/J41-4?
Go to step 9.
Replace HAR-
NESS ASSY LVPS.